I had unprotected sex and my boyfriend came in me. The morning after I had a stomachache with some cramps and I threw up. He’s came in me before and this has never happened. I’m on birth control but I can’t help but think this could be because of pregnancy and I’m very worried. I know some women can know right away. Do you think the vomiting and stomach pain was from something else and just had bad timing or could I be pregnant?